IPC-TM-650 EN 2022 试验方法.pdf - 第784页

1.0 Scope 1.1 To determine the effect on the connector of prolonged exposure to conditions of high humidity at various tempera- tures. Two conditions of test are provided as follows: Steady State Test Used to evaluate th…

Figure 1 One Piece Edge Connector Mechanical Gages

IPC-TM-650

Number

3.4

Subject

Durability, Connectors

Date

1/83

Revision

Page2of2

1.0 Scope

1.1

To determine the effect on the connector of prolonged

exposure to conditions of high humidity at various tempera-

tures. Two conditions of test are provided as follows:

Steady State Test

Used to evaluate the hydroscopic nature

of insulating materials as evidenced by deteriorated physical

properties (dimensions, mechanical strength, etc.) or

degraded electrical properties (e.g., insulation resistance).

Humidity—Temperature Cycling Test

Used to evaluate the

effectiveness of seals and gaskets in the presence of a pres-

sure differential induced by varying temperatures; the corro-

sion resistance of metals and finishes exposed to alternate

periods of condensation and drying; and the hydroscopic

nature of insulating materials, with any degradation acceler-

ated by the ‘‘breathing’’ action imposed by varying tempera-

tures. Optional exposures to sub-freezing temperatures and

to mechanical vibration exaggerate any structural deterioration

of insulating materials.

2.0 Reference Documents

2.1

Information in this section is intended to parallel the test

method described in EIA-RS-364/TP-31.

3.0 Test Specimen

3.1

A connector (plug and receptacle) complete with appli-

cable guide, keying, and engaging hardware or a card- edge

receptacle and mating printed circuit board (if required by the

individual connector specification). The connector or recep-

tacle shall be mated or unmated as specified in the individual

connector specification.

3.2 Neither the plug nor the receptacle shall be mounted or

terminated during the test, unless such mounting (or termina-

tion) is necessary (1) to insure the mechanical integrity of the

component, (2) to measure the specified electrical character-

istic(s), (3) was a requirement of previously imposed environ-

mental or functional tests.

3.3 Printed circuit boards may be conformal coated to

reduce the effect of their deterioration due to moisture on the

connector characteristic(s) under evaluation. The coating shall

not be applied to any portion of the connector under test.

3.4 The plug, receptacle or mated connector shall be sus-

pended or supported within the test chamber in a normal (or

typical mounting attitude using non-corrosive material (e.g.,

plastic, corrosion resisting steel, etc.)). The technique utilized

shall not impede the flow of circulating air over and around the

test specimen.

4.0 Apparatus

4.1

A temperature-humidity chamber capable of maintaining

dry bulb temperatures from + 25°C to + 65°C within ± 2°C of

the set temperatures and relative humidity greater than 90%

during ascending or constant temperature operation and

greater than 80% during descending temperature operation.

Circulation of air within the chamber shall be at a minimum

cubic rate equivalent to five times of non-corrosive material

and shall prevent the dripping of condensate onto the test

specimen.

4.2 A temperature chamber, when required, capable of

maintaining a temperature of -10°C +0, -4°C.

4.3 A temperature measuring device, when required, of suit-

able range for the specified test condition.

4.4 A vibration system, when required, capable of producing

approximately simple harmonic motion at a double amplitude

of 0.60 inch in the frequency range from 10 to 55 Hz.

5.0 Procedure

5.1 Pre-Conditioning

The test specimen shall be condi-

tioned in a dry oven at a temperature of 50°C ±5°C for a mini-

mum period of twenty-four hours. After stabilization at room

ambient conditions, the test specimen shall be subjected to

the pre-test measurements specified in the individual connec-

tor specification.

5.2 Steady-State Test

5.2.1

The test specimen shall be suspended within the

humidity chamber and subjected to a relative humidity of

90-95% at a temperature of 40°C ± 2°C for a period of time

corresponding to one of the test conditions shown in Table 1.

Unless otherwise specified, Test Condition D shall apply.

2215 Sanders Road

Northbrook, IL 60062-6135

IPC-TM-650

TEST METHODS MANUAL

Number

3.5

Subject

Humidity, Connectors

Date

7/75

Revision

Originating Task Group

N/A

Material in this Test Methods Manual was voluntarily established by Technical Committees of the IPC. This material is advisory only

and its use or adaptation is entirely voluntary. IPC disclaims all liability of any kind as to the use, application, or adaptation of this

material. Users are also wholly responsible for protecting themselves against all claims or liabilities for patent infringement.

Equipment referenced is for the convenience of the user and does not imply endorsement by the IPC.

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ASSOCIATION CONNECTING

ELECTRONICS INDUSTRIES

Table I Test Duration

Condition Length of Test (Days)

A56

B21

C10

5.2.2 Final Measurements

5.2.2.1 At High Humidity (See 6.2)

Upon completion of

the exposure period, and while test specimen is still in the

chamber, the measurements specified in the individual con-

nector specification shall be performed.

5.2.2.2 During Recovery Period After removal from the

test chamber, and while maintained at room ambient condi-

tions, the test specimen shall be subjected to the specified

measurements during the specified recovery period.

5.2.2.3 After Recovery Period After being maintained at

room ambient conditions for five hours (or as otherwise speci-

fied) the required measurements shall be performed.

5.3 Humidity-Temperature Cycling Test

5.3.1

The test specimen shall be suspended within the

humidity chamber and subjected to the humidity-temperature

IPC-3-5-1

Figure 1 Graphical Representation of Moisture-Resistance Test

IPC-TM-650

Number

3.5

Subject

Humidity, Connectors

Date

7/75

Revision

Page2of3